Hairbrush



FIG. 1 is a front view of a hairbrush showing the new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a is a plan view thereof;

FIG. 6 is an 6—6 sectional view of FIG. 1;

FIG. 7 is a 7—7 sectional view of FIG. 5;

FIG. 8 is a front view showing a modification of the environmentalstructure; and,

FIG. 9 is a front view showing another modification of the environmentalstructure.

The broken lines showing environment are included for informationpurposes only and form no part of the claimed design.

The ornamental design for a hairbrush, as shown and described.